Motor for piano-playing mechanisms.



No. 837,828. l PATENTED DEG. 4, 1906.

A. A. 6L H. S. HASSELQUIST. MOTOR FOR PIANO PLAYING MEGHANISMS.

ALPPLIOATION FILED MAB.. 7, 190A.

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No. 887,828. PATENTEO DEO-4, 1908. A. A. 8 H. s. HASSBLQUISTI MOTOR FON PIANO PLAYING MEOHANISMS.

APPLICATION FILED MAR. 7, 1904.

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v PATENTED DEG. 4, 1906: A. A. & H. S.'HASSELQUIST.

MOTOR PoR PIANQPLAYING MEGHANISMS. APPLICATION FILED MAB..7,.1904.

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N0- 83 7,828. PATENTED DEC. 4, 1906.

A. A. 6Lv H. S. HASSELQUIST. MOTOR FOR PIANO PLAYING 'MEOHANISMS.

APPLICATION FILED MAB. 7, 1904.

4 SHEETS-SHEET 4.

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UNITED STATES PATENT oEEroE.

ALBERT A. HASSELQUIST AND HUGO S. HASSELQUIST, OF ELGIN, ILLINOIS.

NIOTOR FOR PIANO-PLAYING IVIEOHANISNIS.

Specification of Letters Patent.

Patented Dec. 4, 1906.

Application filed MMGh 7, 1904- SGTR NO- 196,957.

To all whom it may concern:

Be it known that we, ALBERT AIIAssEL- QUrsT and HUGO S. HAssELQUrsT, citizens of the United States, residing at Elgin, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Motors for Piano-Playing Mechanisms, of which the following is a specification.

The principal object of this invention is to provide a simple, economical, and efficient motor for use in connection with the so-called automatic piano-players.

Further objects of the invention will appear from an examination of the drawings and the following description and claims.

The invention consists principally in a piano-playing motor in which there are combined a frame portion, a drivingfriction-disk, a driven friction-disk facing the other and eccentrically disposed for operating the paperrolling mechanism, an intermediate roll for transmitting power and motion from the driving friction-disk to the other, means for changing the position of said intermediate roll to vary the speed of the driven frictiondisk, and means for operating the driving friction-disk.

The invention consists, further and finally, in the features, combinations, and details of construction hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a plan view of one type of machine as it appears when constructed in accordance with these improvements, Fig. 2, a side elevation of the same looking at it from the lower side of Fig. 1; Fig. 3, a sectional elevation taken on line 3 of Fig. 1 looking in the direction of the arrow Fig. 4, a sectional plan view taken on line 4 of Fig. 3 looking in the direction of the arrow Fig. 5, a cross-sectional view taken on line 5 of Fig. 1 looking in the direction of the arrow, Fig. 6, a plan sectional detail taken on line 6 of Fig. 2 looking in the direction of the arrow, and Fig. 7 a sectional detail taken on line 7 of Fig. 4 looking in the drection of the arrow.

In the art to which this invention relates it is well known that it is very desirable to provide a piano-playing motor which shall be simple in construction, economical to build, and eflicient in operation and also one which can be manipulated by the operator with the least amount of trouble, all of which will be understood and appreciated by those skilled in the art.

In constructing a motor in accordance with these improvements we provide a supporting-frame portion of the desired size, shape, and strength and which is preferably formed of a base a, having a multiplicity of uprights or standards b b and b, secured thereto or formed integral therewith in any desired manner, in which the various rotatable shafts are j ournaled, as shown in the drawings.

It is necessary to provide means by which the tempo may be controlled-that is, by `which the speed at which the perforated paper 1 travels may be governed. For this purpose a driving friction-disk c is provided, which is rotatably mounted or held in position by means of a shaft d, which shaft is journaled at one end in one of the uprights or standards b of the frame -of the machine. It is very desirable to impart a longitudinal movement to this shaft at desired times, so as to cause a friotional disengagement and engagement with another disk, hereinafter set forth. In order so to do, a non-rotatable quill or sleeve c is longitudinally and movably mounted in the frame of the machine or in one of the upright standards b thereof, (see Fig. 5,) and in this quill or sleeve the shaft d is also j ournaled. It will be seen that the screw f, in engagement with a slot 2 in said sleeve, permits a slight longitudinal movement of the sleeve, but prevents the rotary movement thereof.

A train of gears composed of a pinion g, spur-wheel Ih, mounted upon a rotatable shaft i, and pinion j, secured to the driving friction-disk shaft, are provided so as to impart power and Amotion from a spring-driven gear-wheel lc to said frictiondisk. This spring-driven wheel is made in the shape of the usual going-barrel used in clocks and is provided with a barrel portion Z, loosely mounted upon a spring or barrel-arbor m. A coiled flat steel spring n is inserted within this going-barrel, as shown in Fig. 2, and, as is usual in such instances, has one end secured to the barrel-arbor and the other to the going-barrel portion. The barrel --farbor should be prevented from rotating during the'l IOO operation of the main train by the usual ratchet mechanism employed in clockwork (not shown) and needs no further illustration or description herein other than to say that it may be operated and the spring wound during the winding operation by means of the gear o and pinion p, which are secured to a winding-shaft q, which windingshaft may be provided with any desired type of silent ratchet mechanism 1*, mounted in a hollow bracket s. As this silent ratchet mechanism, however, forms no material part of this invention, it is .not deemed necessary to illustrate or describe it herein in view of the lfact that such mechanisms are all well known to those skilled in the art. A socketcrank or key should be used to engage with .the stem 3 `for the winding operations.

It is very `desirable that some governing` mechanism be provided to yregulate the speed -of the .main train of gears, and for this purpose a ygovernor is provided (see Fig. 6) formed of a pairof governor-balls t, mounted on lever-arms u, which are fulcrumed or ivoted in a 'collar portion i). The lever-arms of 4this ball-governor have inwardly-projecting `portions w, engaging a notch or groove Qc in the governor-shaft y. The governorycollar o is secured to the governor by a screw vss' 4, so as `to have independent longitudinal and simultaneous rotary movements therewith. Each end of the governor-shaft is provided. with what might be termed braking-disks .2 and .2', one of which, e, is loosely mounted `upon the shaft and driven by means of a pin 5 on the governor-collar, while the other, e', is driven tightly on the governorshaft, so as to rotate therewith. The frame 'of the machine is provided with adjustingscrew-s 10, arranged to be moved inwardly and outwardly, so as to regulate or control the distance between the saine. From this description of construction and operation it will be seen that the outward movement of the governor-balls maybe controlled, in that the distance between the adjusting-screws may be controlled. .As the governor-balls fly outwardly the shaft is pushed in one directionand the governor-collars and brakingdisk z are moved in the other direction, so that 4at undue speeds both braking-disks will contact the adjusting-screws, and thereby prevent further outward movement of the governor-balls and maintain the speed of the main train of gears at desired rates. The governor-shaft .is connected with the main train of gears by means of a pinion 11 thereon engaging with a spur-gear 12 on a shaft 13 which shaft is also provided with a `pinion 14, engaging with a spur-gear 15 on the rotatable shaft of the driving friction-disk.

To provide for the driving of a paper-roll 16 (shown in dotted outline in Fig. 1) in a constant and variable manner to suit the desire of the operator and obtain the desired tempo of the player, a driven friction-disk 17 is provided and oppositely and eccentrically disposed with relation to the driving frictiondisk and having its shaft 18 j ournaled in a standard 19 on the frame of the machine. The outer end of this shaft may be square, as shown, or provided with any other desired contour for engaging with the proper mechanism for supporting and driving the paperholding roll 16. An intermediate frictionroll'2() is provided and rotatably mounted in a lever-arm 21. This intermediate frictionroll is arranged .between and engages the adjacent faces of `the friction-disks, so as to transmit ower and motion from the driving to the criven friction disk. In order to move this intermediate lfriction-roll radially along the faces of the friction-disks, so as to obtain thereby a variation in the speed at which the driven friction-disk may Abe operated, a longitudinally-movable shaft 22 is provided, to which is secured 4the lever-'arm 21, that holds the intermediate friction-roll in position. This shaft is not only longitudinally movable, but also has a rocking motion and is mounted in projecting lugs 23 and 24 on the frame of the machine. A helically-coiled spring 25 is provided and secured to the frame of the machine and to a pin 26 on the longitudinallymovable shaft, so as to hold the intermediate frictionroll normally in-engagement with the driving friction-disk at all times, the reasons for which will more fully hereinafter appear.

At certain times it is necessary to rewind or reroll the ypaper on the original paperholding roll, and at such times the frictiondisks arefrictionally disengaged, so as to permit an easy rewinding of the paper. In order to do this, a second rotatable shaft 27 is provided and ournaled in a suitable bracket or standard 28, secured to the frame of the machine. This shaft is provided with a spur-pinion 29, meshing with and forming part of a supplementary train of gears formed bythe spur-gear 30 and the pinion 31, that are secured to an intermediate rotatable shaft 32, whichis rotatably mounted in a gravity lever-arm 33, as shown particularly in Fig. 3, so that this supplementary train of gears is, by reason of gravity, ynormally disengagedfrom the `main train of gears. When it .is desired to engage these two trains of gears, as hereinafter set forth, the longitudinally-movable shaft y22 is so arranged that its tapered end portion 34 contacts a stud 35 on an intermediate lever 36, thereby raising the gravity lever-arm with its supplementary train of gears into engagement with the gear h of the main train of gears, and as these gears are-constructed and arranged it will be noticed that the second rotatable shaft is given a reverse yrotation from that which it hadduring the playing operation.

In order to give the longitudinally-mov- TOO IIO

- the mechanisms.

able shaft, with its supported intermediate friction-roll, such a movement as to cause said roll to move substantially radially along the faces of the friction-disks, a vibratable controlling-lever 37 is provided and pivotally mounted in the frame of the machine, as shown in Figs. 4 and 5, i This lever has one projecting arm 38 slotted, so as to engage the pin 26 of the longitudinally-movable shaft, and as the controlling-lever is vibrated in one direction or the other the longitudinallymovable shaft is moved or reciprocated, first, outwardly, so as to cause its supported intermediate friction-roll to move radially from the center along the face of the driving friction-disk toward its periphery, thereby increasing its peripheral speed and causing the driven friction disk to operate at a higher rate of speed, and consequently to change the tempo of the playing to such an extent as may be desired. The controllinglever is also provided with a rocking portion 39, having an upwardly-extending arm 40, (see Figs. l and 5,) which engages with the longitudinally-movable quill or sleeve e in such manner that as the rocking portion is rocked in one direction toward the right in Fig. l and toward the left in Fig. 5 the sleeve is moved inwardly, carrying with it the driving friction-disk, and thereby causing a frictional disengagement between both of the friction-disks. As this rocking portion 39 is provided with a handle or wheel 4l, this disengagement can be effected at anytime to suit the desire of the player. A helicallywound spring 42 (shown in Figs. 1 and 4) is provided and secured to the rocking and nonrocking portions of the vibratable controllinglever, so as to preserve the desired yielding relation thereof and at the same time provide for the desired frictional engagement between 'the friction-disks, in that the tension of this spring is transmitted through the rocking portion, its projecting arm 40, and the sleeve e to said driving friction-disk in such manner as to force it outwardly, and thereby frictionally grasp the intermediate driving-roll between both of the disks.

From the above description and an eX- aininatioii of Figs. l, 3, and 4 of the drawings it will be seen that as the vibratable controlling-lever 37 is moved to the left of the player facing it the longitudinally movable shaft is moved to the left, so as to carry the intermediate friction-roll out of engagement with the driven friction-disk. If this were perinitted to happen without some restraining mechanisms being provided, the coiled spring 42 would throw the driving friction-disk and intermediate roll outwardly in such manner as to cause possible destruction to some of ln order to prevent such contingency, the rocking portion of the vibratable controlling-lever is provided with a lever-arm 43, that is adapted to engage the projection 23 on the vframe of the machine just previous to the disengagement of the intermediate roll with the peripheral portion of the driven friction-disk. At this point the lever-arm is moved upwardly, as shown in Fig. 7, rocking the portion 39 and moving the sleeve e with its driving friction-disk longitudinally and slightly inwardly and at a time just previous to the throwing of the suppleinentary `train of gears into engagement with the main train of gears. It will thus be seen that when the supplementary train of gears is in engagement with the main train of gears the driven friction-disk is free to rotate in the desired direction and particularly in such direction as will permit the rewinding of the paper upon the roll 44. At the same time it will be seen that the positions of the driven friction-disk and the intermediate drivingroll are such that a ready rengagement between both the friction-disks of the intermediate roll may be effected without any objectionable or disastrous consequences.

When the driven friction-disk is released from frictional engagement with the driving friction-disk, so as to permit the rewinding operations to take place, it is highly desirable that some restraining mechanism be employed in order to provide for the desired tension on the paper during rewinding. For this purpose a spring-pressed drag 54 is provided and arranged to contact the outer face of the driven friction-disk and place it under a slight restraint, .thereby preventing too easy a rotation of the same.

It is very desirable that the operations of the train of gears may cease at a certain predetermined point-say when the controllinglever reaches the line 45 shown in the graduated plate 46, which point may be called the stop In order to provide for the stopping of the mechanisms at this point, a verticallyarranged braking rock-shaft 47 is provided, having an adjustable screw 48 at its upper end, the inner portion of which is arranged to bear against the braking-disk z of the Governor mechanism. This braking rock-shaft is also provided with a slightly-yielding leverarm 49, adapted to be contacted by a pin 5() on the rocking portion of the vibratable controlling-lever, as shown particularly in Figs. 1 and 4. At such point it will be seen that this braking rocking rod or shaft is moved to such position that its screw comes into intimate engagement with one of the disks on the governor mechanism, compelling the governor to cease its rotation. As the controlling-lever passes inwardly in either direction around this yielding arm 49 the braking mechanism is released and the governor again permitted to rotate. It will therefore be seen that the governor is compelled to stop its rotation at but one pointthat marked 45. When the vibrating controllinglever reaches the graduation 5l, the engaging IOO position of the parts is such that the rewindingoperation takes place. When it is moved in the other direction, so that it reaches the graduation 52, a certain desired increased tempo is obtained, and so on until it reaches the eXtreme graduations 53, when the fastest tempo is obtained.

lt is thus apparent that any desired tempo may be obtained, and that instantaneously,

4 in that the speed of the governor is substantially constant and has no variation between complete cessation and its highest speed of ro.tation the tempo being obtained by the movement of the intermediate friction-roll radially along the surfaces of the frictional disks. It will also be seen that practically all of the desired operations are obtainedby the movement of one part-namely, the simple vibratable controlling-lever, which has a multiplicity of func-tions, and, among others, controls, first, the starting; second, the changing of tempo; third, the pause at any desired time; fourth, the stopping at a predetermined time or point, and, fifth, the rerolling or rewinding operations of the paperrolls, all of which will be understood and appreciated by those skilled in the art.

We claiml. ln a piano-playing mechanism, the combination of a supporting-framework, a driving friction-disk, longitudinally-movable and rotatable shaft mechanism for carrying said friction-disk, a train of gears for operating said friction-disk, means for impartingpowcr and motion to said train of gears, a governor for regulating the speed of said train of gears, a driven friction-disk, an intermediate friction-roll arranged between andv engaging the adjacent faces of the friction-disks, means for moving said intermediate friction-roll radially along the faces of the friction-disks to vary the speed of the driven friction-disk, shaft mechanism by which the driven friction-disk isrotatably supported, controllinglever' mechanism for operating the longitudinally-movable shaft of the driving frictiondisk to.V cause disengagement of the driven friction-disk, and brake mechanism for stopping the train of gears arranged to be operated by the controlling-lever mechanism when it reaches a predetermined position, substantially as described.

2. In a piano-playing mechanism, the combination of a supporting-frame, a driving friction-disk, a rotatable and longitudinallymovable shaft upon which said disk is mounted, a train of gears for operating said friction-disk, spring-driven means for imparting power and motion to said train of gears, a ball-governor for regulating the speed of said train of gears, a driven friction-disk oppositely and eccentrically disposed with relation to the driving friction-disk, a shaft for said driven disk, an intermediate frictionroll arranged between and engaging the adyto operate the same and thereby vary the speed of and cause the disengagement of the driven friction-disk, a second rotatable shaft, and a supplementary train of gears engaging said second rotatable shaft and normally disengaged from the main train of gears and arranged to be thrown intoengagement therewith as the longitudinally-movable supporti ing-shaft for the intermediate friction-roll reaches one limit of its motion, substantially as described.

3. In a piane-playing mechanism, the combination of a supporting-frame, ar driving friction-disk, a rotatable shaft for supporting the same, a non-rotatable sleeve longitudinally movably mounted in the frame of the machine and in which the shaft for the driving-disk is rotatably mounted, a train of gears for operating the driving friction-disk, a spring-driven wheel for imparting power and motion to said train of gears, a governor for regulating the speed of said train of gears, a driven friction-disk oppositely and eccentrically disposed with relation to the driving friction-disk, a shaft upon which said driven friction-disk is mounted, an intermediate friction-roll arranged between and engaging the adjacent faces of the friction-disks forimparting power and motion from the driving to the .driven friction-disk, supporting mechanism for said intermediate roll for moving it substantially radially along the faces. of the friction-disks to vary the speed of the driven friction-disk, brake mechanism adaptedto engage the governor mechanism to stop the operations of the train of gears, and vibratable controlling-lever mechanism for operating the brake mechanism, the intermediate-friction-roll-sup-porting mechanism and the supporting-sleeve of the driving friction-disk to cause the same to be disengaged from frictional engagement and vary the speed of the driven friction-disk, substantially as described.

4. In a piano-playing mechanism, the combination of a supporting-frame, a driving friction-disk, a shaft for supporting the same, a non-rotatable sleeve longitudinally movably mounted in the frame of the machine and in which the shaft for the driving-disk is rotatably mounted, a train of gears for operating the driving friction-disk, a springdriven wheel for imparting-power and motion to said train of gears, a ball-governor for regulating the speed of said train of gears, a driven friction-disk oppositely and eccentrically disposed with relation to the driving IOC IOE

IIE

. the adjacent faces of friction-disk, a shaft friction-disk is mounted, an intermediate friction-roll arranged between and engaging the friction-disks for imparting power and motion from the driving to the driven friction-disk, supporting mechanism for said intermediate roll by which it can be moved substantially radially along the faces of the friction-disks to vary the speed of the driven friction-disk, brake mechanism adapted to engage the governor mechanism to stop the operations of the train of gears, vibratable controlling-lever mechanism for operating the brake mechanism, the intermediate-friction-roll-supporting mechanism and the supporting-sleeve of the driving friction-disk to. cause the same to be disengaged from frictional engagement with and vary the speed of the driven frictiondisk, a second rotatable shaft, and a supplementary train of gears in engagement with the second shaft normally disengaged from the main train of gears and adapted to be thrown into engagement with the main train of gears when the controlling-lever mechanism carries the intermediate friction-roll out of engagement with the driven friction-roll, substantially as described.

5. In a piano-playing mechanism, the combination of a supporting-frame, a driving friction-disk, a shaft therefor, longitudinallymovable sleeve mechanism mounted in the frame of the machine in which said shaft is rotatably mounted, a train of gears for operating the driving friction-disk, a springdriven wheel for imparting power and motion. to the train of gears, a ball-governor for regulating the speed of the train of gears, a driven friction-disk oppositely and eccentrically disposed with relation to the driving friction-disk, an intermediate friction-roll arranged between and engaging the adjacent faces of the friction-disks to impart power and motion from the driving to the driven friction-disk, a shaft upon which the driven friction-disk is mounted, a second rotatable shaft, a supplementary train of gears engaged with the second rotatable shaft and normally disengaged from the main train of gears, a longitudinally-movable shaft for supporting the intermediate friction-roll and moving it radially along the faces of the friction-disks to vary the speed of the driven friction-disk and at or near one limit of its motion to cause alternately the engagement and disengagement of the supplementary A train of gears with the main train of gears, sprlng mechanism for keeping the intermediate friction-roll normally in engagement with the driving friction-disk, and vibratable controlling-lever mechanism engaging with the longitudinally-movable shaft of the intermediate roll and the sleeve of the driving friction-disk to move the same longitudinally, substantially as described.

upon which said driven G. In a piano-playing mechanism, the coInl bination of a supporting-frame', a driving l friction-disk, a shaft therefor, longitudinallymovable sleeve mechanism mounted in the 1 Arame of the machine in which said shaft is rotatably mounted, a train of gears for operating the driving friction-disk, a springdriven wheel for imparting power and motion to the train of gears, a ball-governor for regulating the speed of the train of gears, a driven frictiondisk oppositely and eccentrically disposed with relation to the driving frictiondisk, an intermediate friction-roll arranged between and engaging the adjacent faces of the friction-disks to impart power and motion from the driving to the driven frictiondisk, a shaft upon which the driven frictiondisk is mounted, a second rotatable shaft, a supplementary train of gears engaged with the second rotatable shaft and normally disengaged from the main train of gears, a longitudinally-movable shaft for supporting the intermediate friction-roll and moving it radially along the faces of the friction-disks to vary the speed of the driven friction-disk and at or near one limit of its motion to alternately cause the engagement and disengagement of the supplementary train of gears with the main train of gears, spring mechanism for keeping the intermediate friction-roll normally in engagement with the driving friction-disk, controlling-lever mechanism pivotally secured to the frame of the machine and provided with a portion engaging the longitudinallymovable shaft of the intermediate frictionroll and with a rocking portion engaging the sleeve of the driving friction-disk, and spring mechanism engaging the rocking portion of the controlling-lever to preserve the desired yielding relation of the parts, substantially as described.

7. In a piano-playing mechanism, the combination of a supporting-frame, a driving friction-disk, a shaft therefor, a longitudinally movable and non rotatable sleeve in which said shaft is rotatably mounted, a train of gears for operating the driving friction-disk, a spring-driven wheel for operating the train of gears, a ball-governor for regulating the speednof the train of gears, a driven friction-disk oppositely and eccentrically disposed with relation to the driving frictiondisk, an intermediate friction-roll arranged between and engaging the adjacent faces of the friction-disks, a shaft on the driven friction-disk, a second rotatable shaft mounted in the frame of the machine, a supplementary train of gears engaged with the second rotatable shaft, a longitudinally-movable shaft for supporting the intermediate friction-roll and moving it radially along the faces of the friction-disks to vary the speed of the driven friction-disk and also to contact the supplementary gear mechanism and cause the engagement of the same with the main train of ICO ISO

gears and permit the disengagement at desired times, spring mechanism for keeping the intermediate -friction roll mechanism normally in engagement with the driving friction disk, controlling lever mechanism vibratably mounted in the frame of the machine and provided with one arm engaging tlie longitudinal shaft of the intermediateroll mechanism to operate the same and provided with a rocking portion having an arm engaging the longitudinally-movable sleeve ofthe friction-holding disk so as to move the the operations of the main train of gears, sub- Same and cause fri-ctional engagement and disengagement between the frictional disks, spring mechanism for preserving a yielding relation between the controlling-lever and its rocking portion, and an arm on said rocking portion of the controlling-lever adapted to contact a projection on the frame of the machine and move sucli rocking portion as the controlling-lever reaches a predetermined point and thereby cause frietional diseiigagement between the frictional disks, substantialliy as described.

8. In a piano-playing mechanism, the combinati'on of a supporting-frame, a driving friction-disk, a shaft therefor, a longitudinally-movable and non-rotatable sleeve in which said shaft is rotatably mounted, a train of gears for operating the driving friction-disk, a spring-driven wheel for operating the train of gears, a governor for regulating the speed of thextrain of gears, a driven friction-disk oppositely and eccentrically disposed with relation to the driving frictiondisk, an intermediate friction-roll arranged between and engaging the adjacent faces of the friction-disks, a shaft on the driven f'riction-disk, a second rotatable shaft mounted the'framc of the machine, a supplementary train of gears engaged with the second rotatable shaft, a longitudinally-movable shaft for supporting the intermediate friction-roll and moving it radially along the faces of the friction-disks to vary the speed of the driven friction-disk and also to contact the supplementary train of gears and cause the engagement of the same with the main trainof gears and permit the disengagement thereof at desired times, spring mechanism for keeping the intermediate-friction-roll mechanism norinally in engagement with the driving friction-disk, controlling-lever mechanism vibratably mounted in the frame of the machine and provided with one arm engaging the longitudinal shaft of the intermediateroll mechanism to operate the same and provided with a rocking portion having` an arm engaging the longitudinally-movoble sleeve of` the fr'ction holding-disk so as to move the same and cause frictional engagement and disengagement between the frictional disks, spring mechanism forpreserving a yielding relation between the controlling-lever and its rocking portion, an arm on said rocking portion of the controlling-lever adapted to contact a projection on the' frame of the machine and move such rocking portion as the controlling-lever reaches a predetermined point and thereby cause a frictional disengagement of the frictional disks, brake mechanism arranged to contact the governor and stopl the saine, and a projection on the controlling-lever mechanism adapted to contact the governor-brake mechanism when such lever reaches a predetermined point so as to stop stantially as described.

9. In a piano-playing mechanism, the cornbination of a supporting-framework, a driving friction-disk, a rotatable shaft therefor partially journaled in the frame of the machine, a non-rotatable sleeve longitudinally movably mounted in the frame of the machine in which said shaft is also journaled, a train of gears for operating said friction-disk, means for imparting power and motion to said train of gears, a ball-governor for regulating the speed of said train of gearsh a driven friction-disk oppositely and eccentricallyl disposed with relation to the driving friction-disk, a rotatable shaft therefor, a second rotatable shaft journaled in the frame of the machine, a pinion therefor, a gravityarm mounted o-n the frame of the machine, supplementary gear mechanism formed of the pinion abo-ve mentioned and a compound gear rotatably mounted in said gravity-arm and engaging said pinion, an intermediate friction-roll arranged between and engaging the adjacent faces of thefriction-disks, a longitudinally-movable shaft for supporting and moving the intermediate friction-roll radially along the faces of the friction-disks to vary the speed of the driven friction-disk, ari intermediate lever interposed between the longitudinally-movable shaft and the gravity-arm and arranged to be operated by the movements of said shaft and cause the engagement and disengagement of the supplementary train of gears with the main train of gearsat the desired time or times, drag mechanism for the driven friction-disk, a controlling-lever pivotalfly mounted in the frame of the machine provided with one arm engaging the longitudinally-movable shaft of the intermediate friction-roll to operate the same and having a rocking portion provided with an arm engaging the longitudinally-movable i sleeve of the driving friction-disk to operate the same and thereby cause the frictional engagement and disengagement of the frictiondisks, spring mechanism for preserving the yielding relation between the rocking and non-rocking portions of the controlling-lever and also the frictional engagement between the disks, an arm on said rocking portion of the controlling-lever adapted to contact a IOO IIO

projection on the frame of the machine and tion-roll normally in engagement with the rook said portion so as to cause friotional disdriving friction-disk; substantially as deio engagement between the disks as the interscribed.

mediate friction-roll is passing out of engage- ALBERT A. HASSELQUIST, ment With the driven friction-disk and just HUGO S. HASSELQUIST. previous to the engagement of the supple- Witnesses:

mentary and main train of gears, and spring THOMAS F. SHERIDAN,

mechanism for keeping the intermediate frio HARRY I. CROMER. 

